Dainichi, a relatively small fish food business based in California manufactures the best value koi and goldfish food on the market today. It is made fresh in small runs from ingredients procured locally using a two-step process that retains the quality of the elements that could be degraded though normal pellet extrusion manufacturing as used by all of the big feed mills.
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Hai Feng's Quick Grow formula is a good koi and goldfish food for the budget oriented. It provides a good balance of the nutrients needed and also enhances the color of the fish.